Global weak Morrey estimates for some Ultraparabolic operators of Kolmogorov-Fokker-Planck type

Xiaojing Feng,Pengcheng Niu,Maochun Zhu 대한수학회 2014 대한수학회보 Vol.51 No.5

We consider a class of hypoelliptic operators of the following type L = p0 X i,j=1 aijα2 x ixj + N X i,j=1 bijxiαxj − αt, where (aij ), (bij ) are constant matrices and (aij ) is symmetric positive definite on Rp0 (p0 ≤ N). By establishing global Morrey estimates of singular integral on the homogenous space and the relation between Morrey space and weak Morrey space, we obtain the global weak Morrey estimates of the operator L on the whole space RN+1.

Bayesian Genome-wide Mapping Interacting QTL for Survival Time

Xiaojing Zhou,Dan Zhao 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.8

Observer-based Finite-time Adaptive Prescribed Performance Control for Nonlinear Systems with Input Delay

Xiaojing Qi,Wenhui Liu,Junwei Lu 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.5

In this article, the observer-based adaptive finite-time prescribed performance control issue is studied for a category of nonlinear systems with external disturbances and input delay. The fuzzy logic systems are employed to model the unknown nonlinear terms in the system. The Pade approximation method is utilized to deal with the input delay problem. To estimate the unmeasurable states in the system, a fuzzy state observer is established. By using the finite-time Lyapunov control theory and the backstepping technique, a finite-time adaptive fuzzy controller is designed. The controller can guarantee that the tracking error converges to a prescribed region in a finite time and the boundedness of all signals in the closed-loop system. Finally, a simulation example is included to verify the validity and feasibility of the control method.

X500R QTOF System with SWATH<SUB>®</SUB> Acquisition for Pesticide Residue Screening in Fruits and Vegetables

Xiaojing Sun,Haiyan Cheng,Lijun Li,Wenhai Jin,Kim, Woobok(김우복) 한국농약과학회 2018 한국농약과학회 학술발표대회 논문집 Vol.2018 No.4

Crystallization Behaviors and Morphology of Novel Poly(octamethylene adipate-cooctamethylene succinate) and Poly(octamethylene adipate)

Xiaojing Li,Zhaobin Qiu 한국고분자학회 2015 Macromolecular Research Vol.23 No.7

Crystallization behaviors and morphology of novel biodegradable poly(octamethylene adipate-cooctamethylene succinate) (POAS) copolymers with different octamethylene succinate (OS) contents and their parent homopolymer poly(octamethylene adipate) (POA) were extensively investigated. Compared to POA, increasing the OS unit does not modify the crystal structures but slightly decreases the crystallinity values of POAS. The glass transition temperature values of POAS are greater than that of POA. Both the nonisothermal crystallization peak temperature and melting point temperature values of POAS decrease gradually with the increment of the OS unit. The overall isothermal melt crystallization rates of POAS decrease with increasing crystallization temperature and the OS content, while the crystallization mechanism does not change. The equilibrium melting point values of POAS are reduced with increasing the OS content, with respect to POA. The nucleation densities of POAS spherulites are reduce significantly; moreover, increasing crystallization temperature and the OS content reduces the spherulitic growth rates of POAS, relative to POA.

Sampled-data Robust H∞ Control for T-S Fuzzy Time-delay Systems with State Quantization

Xiaojing Han,Yuechao Ma 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.1

This paper investigates the sampled-data robust H∞ control for T-S fuzzy time-delay systems with statequantization. Based on a modified Lyapunov-Krasovskii function(LKF), which is fully considered the characteristicsof sample-data and state quantization, a sample-data and state quantized controller is designed. By introducingthe free weighting matrices, some integral techniques and modified inequalities, the results in this paper are lessconservative than other existing results. At the end of the paper, two examples are given to show the effectivenessand superiority of the proposed methods.

Parametric study of an undulating plate in a power-extraction regim

Xiaojing Sun,Jihua Zhang,Huizhen Li,Diangui Huang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.1

Our previous studies suggest that instead of propulsion, a body undergoing lateral traveling-wave-like motions can also work like a kinetic energy harvester which extracts energy from moving fluids including wind and water currents. Parameters including wavelength, dimensionless wave velocity and amplitude have critical effects on the energy extraction efficiencies of this type of undulating foil energy harvester. In this paper, a two-dimensional, numerical simulation of a flexible plate undergoing a traveling wave motion was then conducted. At a given dimensionless wave speed, it is found that there exits an optimum wavelength at which this type of energy harvester can extract the maximum amount of kinematic energy from the flow. Moreover, the optimum value of the wavelength increases as amplitude increases. A high efficiency area appears under the optimal combination of wavelength and amplitude. At a given amplitude, the optimal dimensionless wave speed for maximum power extraction decreases with increasing wavelength. The high efficiency area of the undulating plate resulting from the optimal combination of wavelength and wave speed is identified. At a given wave length, there is an optimal value of amplitude at which the maximum energy extraction can be achieved. In this case, a high efficiency area representing the optimal combination of amplitude and wave speed has also been discovered.

Measurement and Assembly of Microminiature Parts Based on Micro Machine Vision

Xiaojing Yang,Siqi Wang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.12

With the development of modern high precision processing technology, precise microminiature electromechanical products have been widely used. Most of the precise microminiature electromechanical products are assembled from microminiature parts.Due to dimensions of the microminiature parts involved are in micro-and nanoscale, which cannot be reached by ordinary cameras, it cannot effectively capture the image of those parts to be assembled, thus affects the assembly. A microscopic vision measurement system of stereo microscope that combined with high resolution CCD camera was developed based on micro machine vision, which uses the MATLAB software to deal with the collected images of microminiature parts such as image smoothing, image sharpening, image segmentation and edge extraction, etc. to study the structures, identification, location and assembly process of microminiature parts. The results show that the visual system we used has accomplished the automatic measurement and precise assembly of miniature parts excellently.

Distinct growth phenomenon observed on L-Arg․ CF3COOH crystals

Xiaojing Liu,Zeyan Wang,Guanghui Zhang,Guangwei Yu,Aidong Duan,Xinqiang Wang,Dong Xu 한국물리학회 2009 Current Applied Physics Vol.9 No.1

Atomic force microscopy has been employed to study the growth behaviour on the {101} facets of L-Arg ․ CF3COOH crystals grown at 25℃ at a supersaturation of σ = 0.2. Nucleation on the wider step terraces and a large nucleus composed of two separate 2D nuclei were observed for the first time. For the region where blocking occurs convex pattern are found in the macrosteps, which correspond to the sites of the impurities that act as pinning points hindering step propagation. Finally, liquid inclusions will be generated because of disparate formation mechanisms. Atomic force microscopy has been employed to study the growth behaviour on the {101} facets of L-Arg ․ CF3COOH crystals grown at 25℃ at a supersaturation of σ = 0.2. Nucleation on the wider step terraces and a large nucleus composed of two separate 2D nuclei were observed for the first time. For the region where blocking occurs convex pattern are found in the macrosteps, which correspond to the sites of the impurities that act as pinning points hindering step propagation. Finally, liquid inclusions will be generated because of disparate formation mechanisms.

Gene Expression Patterns of Cutaneous Squamous Cell Carcinoma and Actinic Keratosis: Biomarkers Screening for Skin Disease Diagnosis

( Xiaojing Li ),( Zhifeng Li ),( Zhao Han ),( Ling Zhang ),( Zhao Liu ),( Baoguo Liu ) 대한피부과학회 2018 Annals of Dermatology Vol.30 No.5

Background: Actinic keratosis (AK) was an intraepidermal tumor which caused by ultraviolet irradiation-induced skin damage. Objective: The aim was to screen biomarkers for development of skin disease by comparing the gene expression profiles between cutaneous squamous cell carcinoma (CSCC) and AK. Methods: GSE45216 with 30 cutaneous squamous cell carcinoma patients and 10 actinic keratosis patients were downloaded and significance analysis of microarrays was processed to screen differently expressed genes (DEGs). Fisher’s exact test was processed for DEGs enrichment. Pathway relationship network systematically reflected the signal conduction and synergism between enriched pathways based on Kyoto Encyclopedia of Genes and Genomes database. Gene co-expression network was constructed according to gene expression data. Quantitative real- time-PCR was used to verify screened biomarkers. Results: Total 410 DEGs were screened and enriched into various functions, such as signal transduction and negative regu-lation of apoptotic process. They also participated into cytokine- cytokine receptor interaction and focal adhesion. The pathway relationship network was constructed with 27 nodes. Hub nodes with higher degree of this network were mitogen-activated protein kinase signaling pathway and apoptosis. The gene co-expression network was constructed with 39 nodes. Thereinto, hub node was ELOVL fatty acid elongase. The expression levels of ELOVL4 and HPGD were significantly higher in CSCC samples than that in AK samples, while the expression levels of INHBA and LAMC2 in CSCC samples were significantly lower than that in AK samples. Conclusion: These screened genes, including ELOVL4, HPGD, INHBA and LAMC2, played important roles in transformation from AK to CSCC. (Ann Dermatol 30(5) 536∼543, 2018)